Lathe spindle feedback

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20 Jun 2021 05:09 - 20 Jun 2021 05:15 #212461 by rohit269
Sir,
Kindly tell us linuxcnc can work with single input (phase A or index) for spindle feedback regarding lathe threading.
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Last edit: 20 Jun 2021 05:15 by rohit269.

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20 Jun 2021 15:12 #212490 by scotth
Replied by scotth on topic Lathe spindle feedback
The problem is you can't tell the direction of rotation, with a single input.

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21 Jun 2021 02:50 #212532 by rohit269
Replied by rohit269 on topic Lathe spindle feedback
Thanks for your reply, but sir, which reason mach3 can work only index signal input for spindle feedback regarding lathe threading.

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21 Jun 2021 03:16 - 21 Jun 2021 04:39 #212533 by PCW
Replied by PCW on topic Lathe spindle feedback
You can use a single input for threading with LinuxCNC
You would connect it to the A and Index input of LinuxCNC
encoder component.

The disadvantage of course is that LinuxCNC is basically guessing the spindle
position between between index signals, so any speed variation in the time between
index signals (say due to varying load) is not accounted for in the Z motion

You could gain a small advantage by using a 1/2 disk rather than a hole since you
could get 2 counts per turn with a small modification of the encoder component.
Last edit: 21 Jun 2021 04:39 by PCW.

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21 Jun 2021 07:34 #212540 by rohit269
Replied by rohit269 on topic Lathe spindle feedback
Thanks for your reply, sir our spindle sensor have only one (Analog/Digital) output so kindly tell us how to use one output into two position (A and index) as per you instruction and also how to configure this in HaL file.
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21 Jun 2021 23:43 #212616 by andypugh
Replied by andypugh on topic Lathe spindle feedback
The connection of the single pulse to both A and Z encoder phases is purely a HAL connection, ie in the software. A single sensor channel and a single IO pin is all that is needed.

(I really must get round to adding missing-tooth index to the encoder component)

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